Sigrid was born in Ålesund, Norway. Her brother Tellef is a musician as well, and she also has a sister named Johanne. During her childhood, she was inspired by Joni Mitchell, Adele and Neil Young.

Sigrid began her career in 2013 by releasing her debut single, "Sun".[4] The song was seen as her national breakthrough in Norway. She later signed to Petroleum Records the following year, and performed at festivals such as Øyafestivalen.

In 2016, Sigrid signed with Island Records. She released her debut single with Island, "Don't Kill My Vibe", in 2017.[8] The song has charted in Norway, Australia, and the United Kingdom. Sigrid also performed on Park Stage at Glastonbury. The Guardian newspaper even suggested that Sigrid may be worthy of headlining the festival in the years to come. She was also a part of The Sims 4: Parenthood soundtrack with the Simlish version of her hit song, "Don't Kill My Vibe". Sigrid performed at the Reading Festival in August 2017. She is featured on the 2017 Justice League soundtrack performing a cover of Leonard Cohen's 1988 classic "Everybody Knows". In 2018, Sigrid was announced as BBC's Sound of 2018. On 10 February 2018, she was a guest presenter for an episode of The Playlist for CBBC. The same month, Sigrid won the Newcomer of the Year award at Spellemannprisen.